Coolant leak 4.0l

[2x4ranger]

I found a coolant leak on my truck about a hour ago. We put uv diy in it a few months ago for another leak so it was still in the coolant. I put a uv light on it and found it was leaking from one plug. Can anyone tell me what the plug is? It’s on the driver side rear on the engine.

 

[2011Supercab]

That's your oil pressure sensor, so it better not be leaking coolant from there.

 

[2x4ranger]

That's your oil pressure sensor, so it better not be leaking coolant from there.

Thank you